Washington (CNN) — The Federal Aviation Administration reported a growing number of their facilities are short-staffed on Friday, including some which have caused delays for travelers.

Phoenix Sky Harbor International airport will not have the normal number of staff in its control tower from 9 p.m. to 1 a.m. ET, but it is already experiencing departure delays due to staffing shortages in the facility that operates the surrounding airspace.

Two separate parts of the Albuquerque Air Route Traffic Control Center, that manages flights over a large portion of the Southwest, is understaffed until 3 p.m. ET.

The Central Florida TRACON, where controllers guide planes approaching or departing Orlando International Airport, will be short-staffed from 7 p.m. ET to 11 p.m. ET.

Two different FAA o

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